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Why is the match being played on a Friday night?

When it emerged that United's remarkable run of 58 consecutive live televised FA Cup ties was to end, it was initially assumed that Derby would the trip to Old Trafford on a Saturday afternoon.

However, instead, the game will kick-off at 8pm on Friday, January 5.

United's neighbours Manchester City have also been drawn at home in the third round, against Burnley, and will kick-off at 3pm on Saturday, January 6.

Police did not want both teams playing at home on the same day, so one fixture had to move.

A spokesman for Greater Manchester Police said: "GMP, Manchester City Council and Transport for Greater Manchester collectively held the view that it was not appropriate for City and United to play on the same day in greater Manchester because of the impact on the transport infrastructure and the city centre.

Old Trafford (Image: Laurence Griffiths/Getty Images)

"This was submitted to the FA – which makes the final decision on fixtures - for their consideration."

In the end, Sunday was not an option for United (or City), as they could be potentially be in Carabao Cup semi-final on the following Tuesday, which would leave little turnaround between matches.

Why will Rams fans have to pay £45 for an adult ticket?

A United spokesman said that it was club policy to retain the same ticket prices for cup games as for Premier League matches and would not charge away fans less than home fans were charged for the equivalent seats.

In the Premier League, a cap has been introduced which means away fans are not charged more than £30 for a seat.

However, this does not apply to the FA Cup and Derby supporters will be housed in East Stand Tier 2 at Old Trafford, where tickets are priced at £45.

This is a different part of the ground to where away fans usually sit for league games, as the cup allocation is larger.

FA Cup rules impose a minimum ticket price of £10 for ties at this stage of the competition but there is no upper limit.

The prices are set by the home team and away fans can only be charged more than home fans if mutually agreed by both clubs.

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As such, Derby have ended up with an allocation of 5,446 tickets for the Friday night encounter.

The Rams said: "The club has agreed this allocation with Manchester United following careful consideration of factors including; date and time of the tie, transport arrangements for our supporters and the pricing of tickets set by the home team.

"We have also sought the views of supporters’ representatives during this process."